PLEASE HELP!! TEST PREP HELP!!

Question

Stephanie sells 12 pretzels per hour. Robert sells 15 pretzels per hour. This week, Robert sold and additional 18 pretzels.Which of the following expressions represents of both people this week, where S represents the number of hours that Stephanie works and R represents the number of hours that Robert worked.

 

A. 12S+15R

 

B. 15S + 12R + 18

 

C. 12S + 18R

 

D. 12S+ 15R + 18

 

If you are a tutor answering this thank you so much! If you have time please answer the rest of the questions I have asked as well. I have a math test tomorrow and I really need to answer these questions to study. Thank you so much!!

Answer 1

D. 

 

However, this problem isn't very realistic.  Sales rates are not constants--even this problem contains evidence of this, by stating that Robert sold "an additional 18 pretzels."